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1764-MM1RTC
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Product Description
The Allen-Bradley 1764-MM1RTC is an Allen-Bradley Memory and Real-Time Clock Module compatible for use with MicroLogix 1500 Programmable Logic Controllers (PLC). The internal memory of this module amounts to 8KB with Real-Time Clock capable of providing an accurate time, day, and year. This module may be used and with other MicroLogix 1500 controller allowing a convenient means of transporting user program, program compare, data file download protection among other functions.Other Available Revisions for the 1764-MM1RTC 1764-MM1RTC//A
Common misspellings:
- l764-MM1RTC
- 176A-MM1RTC
- 1764-MMlRTC
- 1764MM1RTC
Technical Specifications for 1764-MM1RTC
| Manufacturer: | Rockwell Automation |
|---|---|
| Brand: | Allen-Bradley |
| Product Family: | MicroLogix 1200 |
| Product Type: | Memory Module |
| Part Number: | 1764-MM1RTC |
| Supported controllers: | 1764-L24AWA; 1764-L24BWA; 1764-L28BXB |
| Supported controllers: | 1764-LRP; 1764-LSP |
| Allowable Functions: | User Program and Data Back-up, User Program Compare, Data File Download Protection, Memory Module Write Protection and Removal/Insertion Under Power |
| Real Time Clock Accuracy: | 0 ¡C or +32 ¡F, accuracy is +34 to -70 seconds/month. For +25 ¡C or +77 ¡F, accuracy is +36 to -68 seconds/month, for +40 ¡C or +104 ¡F, rated accuracy is +29 to -75 seconds/month and at +55 ¡C or +131 ¡F, accuracy is -133 to -237 second |
| Mounting: | Memory Module slot |
| User Memory: | 8 Kbytes |
| Operating Temperature: | 0-55 deg.C |
| Support automatic loading: | Yes |
| Support for removal under power: | Yes |
| System Status File: | S:2/9 Memory Module Program Compare |
| Control Bits: | Load Memory Module on Memory Error S:1/10 Load Memory Module Always S:1/11 On Powerup, Go to run S:1/12 |
| system Overhead: | 80 µs |
| Configuration Software | RSLogix 500; |
About 1764-MM1RTC
The Allen-Bradley 1764-MM1RTC is a combination module that features a memory module with 8KB memory and a Real-time clock in a common housing. This module is an accessory module for MicroLogix 1500 controller. Not only it provides a battery independent memory, it also provides an accurate time and day reference for scheduling of PLC loads and control elements. Similar to other memory modules, the memory of this combination module is an Electrically Erasable Programmable Read Only Memory (EEPROM). The contents stored to this memory module cannot be easily erased unless a specific voltage is applied to the memory componentÕs pin. This memory component is sensitive to electrostatic discharge. It may not completely delete the program but corrupt parts of the data causing unreadable or unrecognized file. The Real Time Clock has an accuracy of 0 ¡C or +32 ¡F, accuracy is +34 to -70 seconds/month. For +25 ¡C or +77 ¡F, accuracy is +36 to -68 seconds/month, for +40 ¡C or +104 ¡F, rated accuracy is +29 to -75 seconds/month and at +55 ¡C or +131 ¡F, accuracy is -133 to -237 seconds/month. These values are expected worst case values over a 31-day period. Allowable functions of the memory module include User Program and Data Back-Up, Program Compare, Data File Download Protection, Memory Module Write Protection, and Removal/Insertion Under Power. The memory moduleÕs data and parameters are stored to the memory module information file. This file contains the type of module, part number, series, and revision. The values in this information file remains Zero (0) if no memory module is detected. Similarly, the Real Time Clock information is stored to the RTC function file. Data stored are YR - RTC Year with range of 1998-2097, MON - RTC Month with range of 1-12, DAY - RTC Day of Month with range of 1 to 31, HR - RTC Hours with range of 0 to 23 (military time), MIN - RTC Minutes with range of 0 to 59, SEC - RTC Seconds with range of 0 to 59, DOW - RTC Day of Week with range of 0 to 6 (Sunday to Saturday), DS - Disabled with value select ion of 0 to 1 and BL - RTC Battery Low with Boolean range of 0-1. To burn program to the memory module, an active connection to the controller must be established. Initiate Load to EEPROM command from the COMMS menu > EEPROM > Store to EEPROM. The Real time clock has an unreplaceable battery. When the battery charge has been activated, it warns the user that within 14 days from the first indication, the battery will likely drain. This can be verified via the RTC:0/BL bit. If this bit is set to 1, this confirms that the battery charge is low. If the bit is reset, it may mean that the battery voltage level is within acceptable level of module is not connected.F.A.Q for 1764-MM1RTC
| Q: 1. What is the accuracy of the real-time in this combination module? | A: Real Time Clock accuracy is 0 ¡C or +32 ¡F, accuracy is +34 to -70 seconds/month. For +25 ¡C or +77 ¡F, accuracy is +36 to -68 seconds/month, for +40 ¡C or +104 ¡F, rated accuracy is +29 to -75 seconds/month and at +55 ¡C or +131 ¡F, accuracy is -13 |
|---|---|
| Q: 2. Is the accuracy same with the dedicated Realtime clock module 1764-RTC? | A: Yes, the accuracy are same compared to the dedicated RTC module. |
| Q: 3. Can I use this module to any MicroLogix 1500 controller? | A: Yes, this module supports all MicroLogix 1500 controller. |
PDFsupply Tech
The 1764-MM1RTC is a combination module memory and Real-Time Clock module. The memory size of this module is 8KB. The real-time clock is a useful addition as it enables scheduling using an accurate time and date reference. This allows scheduled energization of equipment and devices to balance runtime and increase efficiency. Comparing to the 1764-MM1 which is a dedicated memory module, the 1764-MM1RTC provides an enhanced functionality due to the Real-time clock.
